The news was confirmed by studio director Miles Jacobson on Twitter, alongside the announcement that next year's game will be available on Windows, Mac and Linux.
"I am delighted to announce that #FM13 has just become the best selling game in the series. Thank you so much for all your support!" Jacobson tweeted.
"So the promised snippet of #FM14 news. As well as being on Mac & Windows, it will also be on Linux. With crossplay!"
The announcement coincides with a weekend Football Manager sale on Steam.
The latest Football Manager includes more than 900 new or improved features across multiple game modes.
Enhancements include an improved 3D match engine, deeper media interactions, the addition of directors of football and a revamped loan system.
It also features the brand new 'Football Manager Classic' and 'Challenge' mode, the former of which removes various advanced features and speeds up matches. It allows players to complete a season in less than ten hours.
'Challenge' mode, on the other hand, gives the player a short-term objective - for example, to avoid relegation with a team severely hampered by injuries or to maintain a side's unbeaten run until the end of the season.
Football Manager 2013 is available now for PC and Mac.
> Read Digital Spy's review of Football Manager 2013
> Read Digital Spy's interview with FM creator Miles Jacobson
Watch a video detailing Football Manager 2013's 'Classic Mode' below: